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<h2><a name="SECTION0025420000000000000000"></a><a name="regrtest"></a>
<br>
23.4.2 Running tests using <tt class="module">test.regrtest</tt> 
</h2>

<p>
<tt class="module">test.regrtest</tt> can be used as a script to drive Python's
regression test suite.
Running the script by itself automatically starts running all
regression tests in the <tt class="module">test</tt> package.
It does this by finding all modules in the package whose name starts with
"<tt class="samp">test_</tt>", importing them, and executing the function
<tt class="function">test_main()</tt> if present.
The names of tests to execute may also be passed to the script.
Specifying a single regression test (<b class="program">python regrtest.py</b>
<b class="programopt">test_spam.py</b>) will minimize output and only print whether
the test passed or failed and thus minimize output.

<p>
Running <tt class="module">test.regrtest</tt> directly allows what resources are
available for tests to use to be set.
You do this by using the <b class="programopt">-u</b> command-line option.
Run <b class="program">python regrtest.py</b> <b class="programopt">-uall</b> to turn on all
resources; specifying <b class="programopt">all</b> as an option for
<b class="programopt">-u</b> enables all possible resources.
If all but one resource is desired (a more common case), a
comma-separated list of resources that are not desired may be listed after
<b class="programopt">all</b>.
The command <b class="program">python regrtest.py</b>
<b class="programopt">-uall,-audio,-largefile</b> will run <tt class="module">test.regrtest</tt>
with all resources except the <b class="programopt">audio</b> and
<b class="programopt">largefile</b> resources.
For a list of all resources and more command-line options, run
<b class="program">python regrtest.py</b> <b class="programopt">-h</b>.

<p>
Some other ways to execute the regression tests depend on what platform the
tests are being executed on.
On <span class="Unix">Unix</span>, you can run <b class="program">make</b> <b class="programopt">test</b> at the
top-level directory where Python was built.
On Windows, executing <b class="program">rt.bat</b> from your <span class="file">PCBuild</span>
directory will run all regression tests.

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<span class="release-info">Release 2.5.1, documentation updated on 18th April, 2007.</span>
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